Pianosa Spring mattress is usable on one side only. Medium load-bearing capacity and designed by Poltrona Frau. Self-moulding; Non-deformable; Breathable and ventilated; Naturally correct sleeping position; Non-removable cover.Composition.1. Natural hemp. Anti-mite, Jacquard weave.2. Staple cotton heat-diffusing All Seasons filling.3. Protective layer.4. Anti-humidity micro-perforated insulation for perfect breathability in non-deforming, high-density expanded POLYCELL.5. Compact white insulation in carded, needled, heat-fused fibres.6. Bonnel spring system with medium load-bearing capacity composed of approximately 450 biconical springs for the double bed. The springs, made of tempered carbon steel wire with diameter 2.2 mm, are connected by carbon steel wire spirals with 1.3 mm diameter.7. Perimeter box support system in non-deforming, high-density, expanded POLYCELL, micro-perforated and anti-humidity.8. Cotton fabricMatching bed bases. Vespero.As a pocket spring mattress, it is not particularly suited to the movement of a manual or electric frame. It goes naturally with a fixed frame